Episode 2.01: Time Will Tell
Part of the team visits London, and as a scene setter we see blurred images of London buses. The number of Routemasters in the footage and the presence
of a Volvo Olympian reveal it to be several years older than the episode:
Episode 3.07: Past Imperfect
Grayline 365, formerly London Transport DMS165 (JGF165K) takes time out from Toronto tour duties to pose as a Denver tour bus. It's a 1972 Park Royal bodied Daimler Fleetline: